EDIT: randomly checked my solutions and this link is broken
youtube playlist: http://www.youtube.com/view_play_list?p=31868BC781CB0971
new link: https://www.youtube.com/playlist?list=PL31868BC781CB0971
Not my videos, but "matrixandraia" has recorded how to solo every level on inferno. It will at least give you insights on how to approach each level and what weapons to use.
On some of the later levels, you COULD solo it by yourself, but sometimes it is a LOT easier if you just have a second controller around to fire off sets of ZEXR guns.
For level 32 and 37, I found the Stampede XM and ZEXR-Guns very useful. (Stampede takes out a lot from far away, and ZEXR mops up.)